Cron tasks quantum elixir

I want to execute a code every minute and I tried an attempt using the following code:

#your_app/mix.exs
defp deps do
    [{:quantum, ">= 1.9.1"},    
     #rest code
  end



#your_app/mix.exs
def application do
    [mod: {AppName, []},
     applications: [:quantum,
     #rest code         
   ]]
  end

#your_app/config/dev.exs
config :quantum, :your_app, cron: [
    # Every minute
    "* * * * *": fn -> IO.puts("Hello QUANTUM!") end
]

This is the one of the answers to this question How to run some code every few hours in Phoenix framework?

However, when I execute iex -S mix it doesn't show any message, neither an error message.

Do you know what the problem would be?